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Simplifying 13x = 6x + 21 Reorder the terms: 13x = 21 + 6x Solving 13x = 21 + 6x Solving for variable 'x'. Move all terms containing x to the left, all other terms to the right. Add '-6x' to each side of the equation. 13x + -6x = 21 + 6x + -6x Combine like terms: 13x + -6x = 7x 7x = 21 + 6x + -6x Combine like terms: 6x + -6x = 0 7x = 21 + 0 7x = 21 Divide each side by '7'. x = 3 Simplifying x = 3
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